566
FNUS72 KJAX 190755
FWSJAX
SPOT FORECAST FOR RSSF UNIT 4...FLORIDA FOREST SERVICE
NATIONAL WEATHER SERVICE JACKSONVILLE FL
255 AM EST FRI DEC 19 2025
FORECAST IS BASED ON IGNITION TIME OF 0700 EST ON DECEMBER 19.
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER
SERVICE.
PLEASE CONTACT OUR OFFICE AT (904) 741-4370 IF YOU HAVE QUESTIONS
OR CONCERNS WITH THIS FORECAST.
DISCUSSION
A COLD FRONT PUSHING THROUGH THE SOUTHEASTERN
GEORGIA THIS MORNING WILL REACH THE BURN AREA AROUND 8-9AM
SHIFTING WINDS TO A NORTHWESTERLY FLOW THROUGH THE LATE MORNING
AND AFTERNOON. WINDS WILL BE BREEZY AND BECOME GUSTY AROUND 1100,
WITH THE STRONGER GUSTS (AROUND 20 MPH) FAVORING A WESTERLY
DIRECTION THROUGH THE AFTERNOON. DESPITE GETTING ABOUT A TENTH OF
AN INCH OF RAIN YESTERDAY, THE DRY AIRMASS PUSHING IN THIS
MORNING WILL LOWER HUMIDITY TOWARD 35-40% THIS AFTERNOON.
TONIGHT, SOME PATCHY FROST (FOR UNSHELTERED AREAS) MAY DEVELOP AS
WINDS TREND VERY LIGHT AND TEMPS FALL TO THE MID 30S.
REST OF TODAY
TIME (EST) 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........83 72 54 44 27 16 6 6 4 4 4
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CHC OF PCPN (%).0 10 0 0 0 0 0 0 0 0 0
CHC OF THDR (%).0 10 0 0 0 0 0 0 0 0 0
TEMP............63 62 65 65 67 68 68 68 68 66 63
RH..............100 100 87 73 56 47 40 39 37 37 41
HEAT INDEX (F)..54 58 62 67 70 72 73 73 73 71 67
WIND CHILL (F)..54 58 62 67 70 72 73 73 73 71 67
20 FT WIND DIR..W W W NW NW W W NW NW NW NW
20 FT WIND SPD..7 8 8 9 9 9 8 8 8 7 6
20 FT WIND GUST.17 20 18 20 20 20 18 17 17 15 13
MIX HGT (KFT)...0.7 1.2 1.6 2.0 2.3 2.7 3.0 2.9 2.9 2.9 2.1
TRANSP WIND DIR.W W NW NW NW W W W NW NW NW
TRANSP WIND SPD.17 18 20 21 21 20 20 18 18 16 14
DISPERSION IDX..13 28 41 51 57 60 63 62 62 59 38
LVORI...........5 4 4 3 1 1 1 1 1 1 1
TONIGHT
TIME (EST) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........3 4 2 2 2 2 3 4 4 4 2 3
WEATHER COV..... PTY
WEATHER TYPE.... FST
TSTM COV........
CHC OF PCPN (%).0 0 0 0 0 0 0 0 0 0 0 0
CHC OF THDR (%).0 0 0 0 0 0 0 0 0 0 0 0
TEMP............58 54 51 49 47 46 44 42 41 39 38 37
RH..............49 59 63 63 68 65 68 70 70 73 73 75
HEAT INDEX (F)..62 58 56 55 54 53 52 51 50 50 49 48
WIND CHILL (F)..62 58 56 55 54 53 52 51 50 50 49 48
20 FT WIND DIR..NW NW NW NW NW NW NW N N N N N
20 FT WIND SPD..5 2 2 3 3 3 3 2 2 2 2 2
20 FT WIND GUST.10 9 9 9 9 8 7 7 7 6 5 6
MIX HGT (KFT)...1.3 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4
TRANSP WIND DIR.NW NW NW NW N N N N N N N N
TRANSP WIND SPD.12 10 10 10 10 10 9 9 9 8 8 8
DISPERSION IDX..19 5 5 5 5 5 4 4 4 4 4 4
LVORI...........2 3 3 3 3 3 3 3 3 3 3 3
SATURDAY
TIME (EST) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........4 4 2 2 2 3 3 4 6 9 11 11
WEATHER COV.....PTY ARS
WEATHER TYPE....FST FST
TSTM COV........
CHC OF PCPN (%).0 0 0 0 0 0 0 0 0 0 0 0
CHC OF THDR (%).0 0 0 0 0 0 0 0 0 0 0 0
TEMP............36 36 38 44 52 58 62 65 68 68 67 64
RH..............79 75 76 68 56 49 46 43 40 40 43 50
HEAT INDEX (F)..48 49 53 58 63 67 69 71 72 72 71 69
WIND CHILL (F)..48 49 53 58 63 67 69 71 72 72 71 69
20 FT WIND DIR..N N N NE NE NE E E E E E E
20 FT WIND SPD..1 1 1 1 2 2 2 2 2 2 2 2
20 FT WIND GUST.6 5 3 3 5 5 6 6 6 6 5 3
MIX HGT (KFT)...0.4 0.4 0.7 1.0 1.3 1.8 2.2 2.7 2.7 2.8 2.9 2.0
TRANSP WIND DIR.N NE NE E E E E E SE SE SE SE
TRANSP WIND SPD.7 7 7 7 7 7 6 6 6 5 5 5
DISPERSION IDX..3 7 7 9 12 16 17 20 19 17 16 12
LVORI...........3 3 3 3 2 2 2 2 2 2 2 2
FORECASTER...BOOTHE
REQUESTED BY...S DALU
TYPE OF REQUEST...PRESCRIBED
.TAG 2527928.0/JAX
.DELDT 12/19/25
.FORMATTERVERSION 2.0.0
.EMAIL SALVATORE.DALU@FDACS.GOV
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